Stacked-Die Electronics Package with Planar and Three-Dimensional Inductor Elements
First Claim
1. A method of forming one or more passive components on a plurality of substrates, the method comprising:
- selecting a first substrate and a second substrate such that an area of the second substrate is less than an area of the first substrates;
forming at least one integrated circuit on a front side of each of the first and second substrates;
forming a plurality of bond pads on the front side of the first substrate;
forming a photoresist layer over a back side of the second substrate;
patterning and etching the photoresist layer to form one or more passive component structures on the back side of the second substrate;
filling the etched areas of the patterned and etched photoresist with a metal; and
electrically bonding the one or more passive component structures to selected ones of the plurality of bond pads.
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Accused Products
Abstract
An apparatus and a method for producing three-dimensional integrated circuit packages. In one embodiment, an electronics package with at least two dice are stacked one atop another is disclosed. A top die is of smaller size compared with a bottom die such that after a die attach operation, wire-bond pads of the bottom die will be exposed for a subsequent wire bonding operation. The bottom die contains contact pads on the front side that couple with one or more passive components fabricated on the back side of the top die to complete the circuit. In another exemplary embodiment, a method to form one or more three-dimensional passive components in a stacked-die package is disclosed wherein partial inductor elements are fabricated on the front side of the bottom die and the back side of the top die. The top and bottom elements are coupled together completing the passive component.
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Citations
22 Claims
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1. A method of forming one or more passive components on a plurality of substrates, the method comprising:
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selecting a first substrate and a second substrate such that an area of the second substrate is less than an area of the first substrates; forming at least one integrated circuit on a front side of each of the first and second substrates; forming a plurality of bond pads on the front side of the first substrate; forming a photoresist layer over a back side of the second substrate; patterning and etching the photoresist layer to form one or more passive component structures on the back side of the second substrate; filling the etched areas of the patterned and etched photoresist with a metal; and electrically bonding the one or more passive component structures to selected ones of the plurality of bond pads. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method of forming one or more passive components on a plurality of substrates, the method comprising:
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selecting a first substrate and a second substrate such that an area of the second substrate is less than an area of the first substrate; forming at least one integrated circuit on a front side of each of the first and second substrates; forming a plurality of bond pads on the front side of the first substrate; forming a first portion of at least one passive component structure on a back side of the second substrate; forming a second portion of at least one passive component structure over the at least one integrated circuit on the front side of the first substrate, the second portion being a mirror image of the first portion; and electrically bonding the first and second portions of the at least on passive component structure. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17)
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18. An integrated circuit device comprising:
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a first substrate having a front side and a back side, the front side of the first substrate having one or more integrated circuit devices and a plurality of bond pads fabricated thereon; a second substrate having a front side, a back side, and a smaller area than the area of the first substrate, the front side of the second substrate having one or more integrated circuit devices fabricated thereon, wherein the first and second substrates are in a stacked relationship with the front side of the first substrate positioned adjacent the back side of the second substrate; a first portion of at least one passive component fabricated onto the back side of the second substrate, the first portion of the at least one passive component being comprised of a metal structure; a second portion of the at least one passive component fabricated onto the front side of the first substrate, the second portion of the at least one passive component being comprised of a metal structure formed to mirror the first portion; and an electrical conductor configured to allow electrical communications between the two portions of the at least one passive component. - View Dependent Claims (19, 20, 21, 22)
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Specification